Illuminating-indicator.



A. JUNGHANS.

ILLUMINATING INDICATOR.

APPLICATION FILED APB..13, 1910.

1,036,256, Patented Augfzo, 1912.

ARTHUR JUNGHANS, OF SCHRAMBEEG, GERMANY.

ILLUMINATING-NDICATOR.

Specification of Letters Patent.

Patented Aug. 20, 1912.

Application led April 13, 1910. Serial No. 555,297.

To all 'whom it may concern Be it known that I, ARTI-1YR JUNGHANS,

privy commercial councillor, a subject of the King of lVurttemberg, residing `at Schramberg, in the Kingdom of Wurttemberg, Germany, have invented certain new and useful Illuminatin -Indicators, of which the following is a ull, clear, and exact description.

The present invention has for its object a method for fixing the illuminating medium employed for the indicating parts such as dials and hands of clocks, scales or the like in the form of dots, etc., whereby the said medium is prevented from injury and from falling off.

Heretofore the illuminating medium has been arranged upon the indicating parts, for example on an enameled dial, generally in the form of points or dots for example by boring the dial above the figures to a certain depth, then coating the bottom of the bore with adhesive material upon which the illuminating medium was placed, a thin sheet of celluloid was then stuck upon the dial over this illuminating material in order to prevent it from' falling out as a result of shocks. A similar procedure was adopted in applyin such illuminating medium to the hands or tie like. This method presents the defect that the consumption of illuminating material was very irregular, while in addition this material and the covering mutually influenced and colored each other, thereby weakening the luminosity and finally the protecting coverings, on the dial, particularly impaired the appearance necessarily resulting in rendering the sale of such clocks more difficult. These defects are obviated by means of the present method which consists in the first place in providing the indicatin parts to which the illuminatingmass is to e applied with a through bore or perforation, then arranging a covering of glass, enamel or the like over one side of this part and finally introducing into the -bore thus covered on one side an adhesive material and then sprinkling the illuminating material thereon.

By way of example a dial embodying the of the perforations being presented Without the illuminating mass but with the covering,

vand the other with both the illuminating mass and cover. Fig. 3 is an enlarged sec- `tional view of .the left hand portion of? Fig. 2. Fig. 4 is an enlarged sectional view of the right hand portion of Fig. 2.

In accordance with the invention the dial comprising the metal back or foundation, a, and the enamel covering a', which are bot-h provided with perforations b extending throughout its entire thickness, thereupon the dial is provided in the furnace with a covering of glass, enamel or the like so that a transparent mass c is provided rabove the perforations which forms windows c', and these perforations are therefore closed in front. Instead of providing this covering, the perforations b might be closed by fusing in circular glass disks.`\ The windows c are then either coated with adhesive material from behind-and the illuminating mass d arranged thereon, or elements such as pieces of paper or cardboard are coated with adhesive material, the illuminating mass sprinkled thereon, whereupon small disks or the like are stamped out in correspondence with the per;- forations or other recesses, these disks being inserted in the perforat-ions from behind with the illuminating material against the window. In the case of other lndicating parts such as hands or the like a similar method is adopted for fixing and securing the illuminating material. 'In order to facilitate the operation the indicating parts such as the clock hands are made of copper. The bores and cavities on the indicating parts can be given any desired form and size, and they can be arranged in any convenient manner.`

What I claim as my invention and desire to secure by Letters Patent is:

1. A self-illuminating device comprising in combination, a foundation body provided withf a plurality of openings extending therethrough, a transparent mass fused on one side of said body and extending across said openings to close the same on one side of said body, and elements having an illuminating material adhered thereto and inserted intothe openings behind the transparent mass.

2. A self illuminating clock dial comprising in combination, a back portion having an enamel like covering and op1 nings or In testimony whereof I'ax my signature perforations extendlng through he back in presence of two witnesses.

por on and covering; transparent mass ex- ARTHUR JUNGHANS. ten ing across sald openings, and self illu- Witnesses: 5 mi atin material disposed in said openings ERNEST ENTENMANN,

fro be ind said back portion. FRIDA KLAInEe. 

